CN110246449B - Adjusting method and device of display panel - Google Patents
Adjusting method and device of display panel Download PDFInfo
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- CN110246449B CN110246449B CN201910528177.1A CN201910528177A CN110246449B CN 110246449 B CN110246449 B CN 110246449B CN 201910528177 A CN201910528177 A CN 201910528177A CN 110246449 B CN110246449 B CN 110246449B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The invention discloses a method and a device for adjusting a display panel, and belongs to the technical field of display. The method comprises the following steps: acquiring a target image, determining an abnormal area in the target image, wherein the abnormal area is an area corresponding to a foreign matter positioned outside a display panel in the target image, and adjusting the brightness uniformity of the display panel according to the target image and the abnormal area. Because when the brightness uniformity of the display panel is adjusted according to the abnormal area and the target image, the influence of the abnormal area on the brightness uniformity adjustment of the display panel can be avoided, the interference of foreign matters on the acquired target image is avoided, and the effect of the demura technology is ensured.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for adjusting a display panel.
Background
The self-luminous display panel has the advantages of fast response, wide viewing angle, high brightness, bright color, lightness, thinness and the like. However, the phenomenon of uneven brightness (Mura) of a display screen is likely to occur due to a production process of the self-luminous display panel or loss in use, and the technique of removing the phenomenon of uneven brightness (Demura) is a technique of detecting the Mura phenomenon in the display panel and removing the Mura phenomenon to make the brightness of the display screen uniform.
Wherein the process of detecting the Mura phenomenon in the display panel includes: controlling a display panel to display an image; collecting an image corresponding to the image by a Capacitive Coupling Device (CCD) camera; and acquiring the brightness value of each pixel in the image, and analyzing the brightness value to determine the region in which the Mura phenomenon occurs in the display picture. The process of eliminating the Mura phenomenon includes: the brightness of the area where the Mura phenomenon appears in the display picture is adjusted, so that the area which is too dark becomes bright, and the area which is too bright becomes dark, and the uniform display effect is achieved.
However, when a picture displayed on the display panel is captured by the CCD camera, foreign matter (e.g., dust) may fall on the display panel, and interfere with an image captured by the CCD camera, resulting in an undesirable effect of Demura.
Disclosure of Invention
The embodiment of the invention provides a method and a device for adjusting a display panel, which can solve the technical problems in the related art. The technical scheme is as follows:
according to a first aspect of the present invention, there is provided a method of adjusting a display panel, the method comprising:
acquiring a target image, wherein the target image is an image obtained by shooting a display picture of a display panel displaying a specified brightness picture;
determining an abnormal area in the target image, wherein the abnormal area is an area corresponding to a foreign matter located outside the display panel in the target image;
and adjusting the brightness uniformity of the display panel according to the target image and the abnormal area.
Optionally, the determining an abnormal region in the target image includes:
determining the area where the sub-pixels with the brightness values smaller than the specified brightness threshold value in the target image are located as the abnormal area, wherein the specified brightness threshold value is smaller than the specified brightness;
the adjusting of the brightness uniformity of the display panel according to the target image and the abnormal area comprises:
updating the brightness values of the sub-pixels in the abnormal region in the target image, so that the brightness values of the sub-pixels in the abnormal region are not less than the specified brightness threshold;
and adjusting the brightness uniformity of the display panel based on the updated target image.
Optionally, the updating, where the target image is a gray image, the luminance values of the sub-pixels in the abnormal region so that the luminance values of the sub-pixels in the abnormal region are not less than the specified luminance threshold includes:
respectively taking each pixel in the abnormal area as a first abnormal pixel, and performing a brightness value updating operation until the brightness value of each sub-pixel in the abnormal area is greater than or equal to the specified brightness threshold, wherein the brightness value updating operation comprises:
determining a designated pixel around the first abnormal pixel, wherein the brightness value of the sub-pixels in the designated pixel is greater than or equal to the designated brightness threshold value, and the brightness value of each sub-pixel in the designated pixel is the same;
and updating the brightness value of each sub-pixel in the first abnormal pixel to the brightness value of the sub-pixel in the appointed pixel.
Optionally, the determining a specified pixel around the first abnormal pixel includes:
and determining the specified pixel in the four adjacent domains of the first abnormal pixel and the extending direction of the four adjacent domains by taking the first abnormal pixel as a center according to a specified sequence.
Optionally, before the target image is acquired, the method includes:
arranging a shelter outside the display panel, wherein the orthographic projection of the shelter on the display picture of the display panel is positioned in a designated area;
acquiring a test image, wherein the test image is an image obtained by shooting a display picture of a display panel displaying the specified brightness picture;
and determining the brightness value of the corresponding area of the specified area in the test image as the specified brightness threshold value.
Optionally, the determining an abnormal region in the target image includes:
determining a difference between a target luminance value and a luminance value of each pixel region in the target image as a compensated luminance value for each of the pixel regions, the pixel region comprising at least one pixel;
determining a pixel region of which the compensation brightness value is greater than a compensation threshold value as the abnormal region;
the adjusting of the brightness uniformity of the display panel according to the target image and the abnormal area comprises:
and according to the target image, adjusting the brightness uniformity of the area of the display panel except the area corresponding to the abnormal area.
According to a second aspect of the present invention, there is provided an adjustment apparatus of a display panel, the apparatus comprising:
a first acquisition module configured to acquire a target image, the target image being an image obtained by shooting a display screen of a display panel displaying a screen with a specified brightness;
the first determining module is used for determining an abnormal area in the target image, wherein the abnormal area is an area corresponding to a foreign matter positioned outside the display panel in the target image;
and the adjusting module is used for adjusting the brightness uniformity of the display panel according to the target image and the abnormal area.
Optionally, the first determining module includes:
the determining submodule is used for determining an area where a sub-pixel with a brightness value smaller than a specified brightness threshold value in the target image is located as the abnormal area, and the specified brightness threshold value is smaller than the specified brightness;
the adjustment module includes:
the updating submodule is used for updating the brightness values of the sub-pixels in the abnormal region in the target image, so that the brightness values of the sub-pixels in the abnormal region are not smaller than the specified brightness threshold;
and the adjusting submodule is used for adjusting the brightness uniformity of the display panel based on the updated target image.
Optionally, the target image is a grayscale image, and the update sub-module is configured to:
respectively taking each pixel in the abnormal area as a first abnormal pixel, and performing a brightness value updating operation until the brightness value of each sub-pixel in the abnormal area is greater than or equal to the specified brightness threshold, wherein the brightness value updating operation comprises:
determining a designated pixel around the first abnormal pixel, wherein the brightness value of the sub-pixels in the designated pixel is greater than or equal to the designated brightness threshold value, and the brightness value of each sub-pixel in the designated pixel is the same;
and updating the brightness value of each sub-pixel in the first abnormal pixel to the brightness value of the sub-pixel in the appointed pixel.
Optionally, the update sub-module is configured to:
and determining the specified pixel in the four adjacent domains of the first abnormal pixel and the extending direction of the four adjacent domains by taking the first abnormal pixel as a center according to a specified sequence.
Optionally, the apparatus includes:
the setting module is used for setting a shelter outside the display panel before a target image is acquired, and the orthographic projection of the shelter on the display picture of the display panel is positioned in a designated area;
a second acquisition module configured to acquire a test image, where the test image is an image obtained by shooting a display screen of a display panel that displays the specified luminance screen;
and the second determining module is used for determining the brightness value of the corresponding area of the specified area in the test image as the specified brightness threshold.
Optionally, the first determining module is configured to:
determining a difference between a target luminance value and a luminance value of each pixel region in the target image as a compensated luminance value for each of the pixel regions, the pixel region comprising at least one pixel;
determining a pixel region of which the compensation brightness value is greater than a compensation threshold value as the abnormal region;
the adjusting module is configured to:
and according to the target image, adjusting the brightness uniformity of the area of the display panel except the area corresponding to the abnormal area.
According to a third aspect of the present invention, there is provided a computer-readable storage medium having at least one instruction stored therein, the instruction being loaded and executed by the processor to implement the operations performed by the adjustment method of the display panel according to any one of the first aspect.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the adjusting method and device for the display panel, provided by the embodiment of the invention, when the brightness uniformity of the display panel is adjusted, the abnormal area of the foreign matter positioned outside the display panel in the target image is considered, when the brightness uniformity of the display panel is adjusted according to the abnormal area and the target image, the influence of the abnormal area on the brightness uniformity adjustment of the display panel can be avoided, the interference of the foreign matter on the acquired target image is avoided, and the effect of the demura technology is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of an adjusting method of a display panel according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for adjusting a display panel according to another embodiment of the present invention;
FIG. 3 is a flow chart of determining a specified brightness threshold provided by an embodiment of the present invention;
FIG. 4 is a flowchart illustrating updating luminance values of sub-pixels in an abnormal region in a target image according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating another exemplary method for adjusting a display panel according to an embodiment of the present invention;
fig. 6 is a block diagram of an adjusting apparatus of a display panel according to an embodiment of the present invention;
FIG. 7 is a block diagram of an adjustment module provided by an embodiment of the present invention;
fig. 8 is a block diagram of an adjusting apparatus of another display panel according to an embodiment of the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The self-luminous Display panel can independently emit light relative to a Liquid Crystal Display (LCD), and is not required to be provided with a backlight source, which is helpful for realizing the lightness and thinness of the Display panel. The self-luminous Display panel can be an Organic Light Emitting Diode (OLED) Display panel or a Quantum Dot Light Emitting diode (QLED).
In the manufacturing process of the self-luminous display panel, foreign matters (english) may adhere to the glass substrate and the film layer of the self-luminous display panel, which may cause non-uniform brightness of the self-luminous display panel, or may cause non-uniform brightness of the self-luminous display panel due to non-uniformity of electrical parameters such as mobility and threshold voltage of the thin film transistor, that is, mura phenomenon. The demura technique is widely used by manufacturers of large self-luminous display panels because of its flexibility and simplicity, and is used for detecting and eliminating mura phenomenon of the self-luminous display panels.
In the demura process of the self-luminous display panel, firstly, a display picture of the self-luminous display panel is collected through a CCD camera, then the brightness of each pixel in an image of the collected display picture is adjusted point by point, and the brightness values of all pixels are consistent, so that the brightness of the self-luminous display panel is uniform.
Since the self-luminous display panel is exposed to the air when the CCD camera is used to photograph the self-luminous display panel, foreign substances such as dust or metal powder present in the air inevitably fall on the outside of the self-luminous display panel, for example, on the light emitting surface of the self-luminous display panel. If the CCD camera collects the display image of the self-luminous display panel at this time, an image corresponding to a foreign object may appear in the collected image of the display image, and if the luminance of the self-luminous display panel is adjusted based on the image, the result of the adjustment may be inaccurate.
For example, since most of the foreign matters existing in the demura process are fine dust or particles with extremely poor light transmittance such as metal dust, a display screen of the self-luminous display panel collected by the CCD camera may have an obviously visible dark dot, and since the gray value of the dark dot is low, when the brightness of the self-luminous display panel is adjusted based on the display screen, the gray value of a region corresponding to the dark dot may be increased, and further, the adjusted self-luminous display panel may reappear a dot or a cluster mura with extremely high brightness value, which greatly affects the image quality of the self-luminous display panel.
At present, the foreign matters outside the display panel positioned in the demura process are usually eliminated by adopting physical modes such as blowing dust removal or personnel wiping, but the physical modes are low in efficiency and high in labor cost, and new foreign matters can fall again in the wiping or blowing dust removal process, so that the effect is not ideal.
The applicant of the present application has found that, in the process of manufacturing a self-luminous display panel, if the luminance of the self-luminous display panel is not uniform due to a foreign substance (the foreign substance is a foreign substance attached to the inside of the display panel in the process of manufacturing the display panel) or the non-uniformity of the electrical parameters of the thin film transistors, the generated mura are both dot-shaped mura or lump-shaped mura with high gray-scale values (i.e., bright), and mura with low gray-scale values (i.e., dark black) are not found, that is, if mura with low gray-scale values appears in an image obtained by photographing a display screen, it is inferred that the foreign substance exists outside the display panel.
Based on this, the embodiment of the present application provides an adjusting method of a display panel, as shown in fig. 1, the method includes:
And 102, determining an abnormal area in the target image, wherein the abnormal area is an area corresponding to a foreign matter positioned outside the display panel in the target image.
In summary, in the adjusting method for the display panel according to the embodiment of the present invention, when the brightness uniformity of the display panel is adjusted, the abnormal area of the foreign object located outside the display panel in the target image is considered, and when the brightness uniformity of the display panel is adjusted according to the abnormal area and the target image, the influence of the abnormal area on the brightness uniformity adjustment of the display panel can be avoided, the interference of the foreign object on the acquired target image is avoided, and the effect of the demura technology is ensured.
Compared with the method of manually removing the foreign matters on the light emitting side of the display panel in a physical mode, the method for adjusting the display panel provided by the embodiment of the invention reduces the time cost and the labor cost, and has higher demura effect and efficiency.
The Demura technique may include the following two steps: firstly, detecting a mura phenomenon in a display panel; second, the mura phenomenon is eliminated. The embodiments of the present invention may provide a method for adjusting a display panel based on the above steps 101 to 103 for the two steps in the demura technique, respectively, and the brightness value of the portion covered by the foreign object is estimated based on the brightness uniformity principle of the display screen of the self-luminous display panel, so as to achieve the effect of ignoring the foreign object, thereby ensuring the effectiveness of the demura technique.
Fig. 2 illustrates another adjusting method for a display panel according to an embodiment of the present invention, which may be performed by an adjusting apparatus for a display panel, which may be a terminal or other apparatus with computing capability. In the method, in step 103, the adjusting of the brightness uniformity of the display panel according to the target image and the abnormal area may include: filling abnormal areas in the target image by adopting non-abnormal areas in the target image so as to update the target image with the abnormal areas to a new target image, and adjusting the brightness uniformity of the display panel based on the new target image so as to make the brightness of a display picture displayed by the display panel uniform, wherein the non-abnormal areas are areas without corresponding foreign matters in the target image, and the abnormal areas corresponding to the foreign matters are eliminated in the new target image. Optionally, the process may include:
The specified brightness threshold is used to determine an abnormal region in the target image. In order to ensure that the abnormal region in the target image can be effectively determined and prevent the brightness value of the target image from interfering with the brightness value of the abnormal region, the specified brightness threshold may be smaller than the specified brightness displayed on the display screen. In order to effectively determine the abnormal region, the specified brightness threshold may be determined in advance according to the brightness value of the test image and the brightness value of the region corresponding to the foreign object in the test image. The test image is an image obtained by shooting a display image of a display panel displaying a specified brightness image, in order to ensure that the determined specified brightness threshold is relatively accurate, the abnormal area can be effectively determined, and the display image of the display panel when the test image is acquired can be the same as the display image of the display panel when the target image is acquired.
The brightness value of the test image is determined by the brightness of the ambient light (including natural light and light emitted by the CCD camera) when the display image is captured and the brightness value of the display image displayed by the display panel. For example, for a display screen having the same luminance value, the brighter the ambient light, the higher the luminance value of the target image, and conversely, the darker the ambient light, the lower the luminance value of the target image. Therefore, the display panel can be placed in a predetermined environment in advance, and the brightness value of the target image obtained by shooting the display screen of the display panel displaying the predetermined brightness screen by using the predetermined CCD camera in the environment can be determined. The designated environment may be an environment for acquiring a target image, and the designated CCD camera may be a CCD camera for capturing the target image.
The brightness value of the corresponding region of the foreign matter in the test image can be determined by simulating the falling of the foreign matter on the display panel in advance. Optionally, as shown in fig. 3, the process of the simulation may include the following steps:
in step 2011, a mask is disposed outside the display panel, and the orthographic projection of the mask on the display screen of the display panel is located in the designated area.
The process of arranging the shielding object can place the shielding object outside the display panel in an active placing mode, and the shielding object is used for simulating foreign matters possibly occurring in the environment.
When the shielding object is arranged in an active shielding object placing mode, the designated area can be a pre-marked area on the display panel, the number of the designated areas can be 1 or more, and when the number of the designated areas is more, the designated areas can be uniformly distributed on the display panel.
Alternatively, a test image may be captured by a CCD camera and acquired by an adjustment device of the display panel.
The corresponding region of the designated region in the test image may include at least one pixel, and the brightness value of the corresponding region of the designated region in the test image may be the brightness value of any one of the at least one pixel, or the average value of the brightness values of the at least one pixel, or the maximum value of the at least one pixel, etc. Illustratively, the specified brightness threshold is 10.
Of course, in other alternative implementations, the specified brightness threshold may also be determined according to optical characteristics of the display panel, and the like, which is not limited in this embodiment of the present invention.
It should be noted that, in step 2011, the blocking object is set in a manner of manually placing the blocking object, and since the designated area can be an area manually labeled in advance, the determined designated brightness threshold can be flexible.
After step 201 is completed, a physical manner may be adopted to eliminate the setting of the shielding object outside the display panel, or to replace the display panel to be demura, which is not limited in the embodiment of the present invention.
In order to effectively determine the abnormal area in the target image, the color displayed by each pixel in the display signal received by the display panel for presenting the display screen is consistent, and of course, if the display panel has a mura phenomenon, it may be difficult for each pixel to present a consistent color.
Alternatively, the step of acquiring the target image may be implemented by reading the target image using programming software in the terminal. Taking Matlab as an example of programming software, assuming that after a target image of a display panel is acquired by a CCD, the target image is stored in a terminal equipped with Matlab, and the target image is acquired by inputting a command I ═ imread (' storage path of the target image in the terminal. The immead function is used for reading a target image and storing the target image in a pixel matrix form. The pixel matrix is a three-dimensional matrix and is identified by the letter I, which represents the three pixel channels of the target image, namely the red pixel (the luminance value of the red pixel is identified by the letter R), the green pixel (the luminance value of the green pixel is identified by the letter G) and the blue pixel (the luminance value of the blue pixel is identified by the letter B). Wherein, each pixel channel is a two-dimensional array (also called two-dimensional matrix).
Therefore, in step 202, the process of acquiring the target image may be a process of acquiring a three-dimensional matrix corresponding to the target image. The subsequent step may be a process of processing the data in the three-dimensional matrix.
Optionally, a region in which a pixel in the target image whose luminance value is smaller than the specified luminance threshold determined in step 201 is located may be determined as an abnormal region, and the abnormal region may include at least one sub-pixel whose luminance value is smaller than the specified luminance threshold. Step 203 may be implemented by:
and S1, traversing the target image, and determining the sub-pixels with the brightness values smaller than the specified brightness threshold value in the target image.
S2, the region (or the region composed of the sub-pixels) whose luminance values are smaller than the specified luminance threshold is determined as an abnormal region.
Taking the target image as a gray-scale image as an example, since the luminance values in the red pixel channel, the green pixel channel and the blue pixel channel in the gray-scale image are all the same, that is, R ═ G ═ B, the three-dimensional matrix corresponding to the target image is composed of 3 completely same two-dimensional arrays, so to reduce the spatial complexity, the luminance value in any one pixel channel (i.e., one two-dimensional array) may be taken to represent the luminance value of the target image, and the luminance value is represented by the two-dimensional array. The two-dimensional array can show the abscissa and the ordinate of each sub-pixel in any pixel channel. And assigning the brightness values of all the sub-pixels in any one pixel channel to corresponding positions in the two-dimensional array according to the sequence of the coordinates of the target image. For example, the brightness values R of all red pixels in the red pixel channel are correspondingly assigned to corresponding positions in the two-dimensional array according to the coordinate order of the target image. Because the gray image is represented by a two-dimensional array, the brightness value of each sub-pixel in the two-dimensional array can be traversed, the brightness value of each sub-pixel is compared with a specified brightness threshold value to determine the sub-pixel of which the brightness value is smaller than the specified brightness threshold value in the target image, and then the area where the sub-pixel of which the brightness value is smaller than the specified brightness threshold value is located is determined as an abnormal area.
Alternatively, the abnormal region may be determined by a pixel, in addition to the sub-pixel. Then in step 203, the region in which the pixels with brightness values smaller than the specified brightness threshold value in the target image are located may be determined as an abnormal region. The luminance value of a pixel can be obtained by adding the luminance values of each of the sub-pixels constituting the pixel in a specified ratio.
And 204, updating the brightness values of the sub-pixels in the abnormal region in the target image, so that the brightness values of the sub-pixels in the abnormal region are not less than a specified brightness threshold.
Alternatively, a luminance value not less than a specified luminance threshold value may be determined in advance, and the luminance value of a sub-pixel in the abnormal region in the target image may be updated with the luminance value, or a luminance value of a certain sub-pixel may be determined around the abnormal region, and the luminance value of a sub-pixel in the abnormal region in the target image may be updated with the luminance value.
Optionally, the target image is a gray-scale image, and a process of updating the luminance values of the sub-pixels in the abnormal region in the target image by using the luminance value of a certain sub-pixel around the abnormal region may be as shown in fig. 4, that is, step 204 may include:
Wherein the luminance value updating operation includes: and determining a designated pixel around the first abnormal pixel, wherein the brightness value of the sub-pixels in the designated pixel is greater than or equal to a designated brightness threshold value, and the brightness value of each sub-pixel in the designated pixel is the same. Optionally, the process may include: and determining the specified pixel in the extending directions of the four adjacent domains and the four adjacent domains of the first abnormal pixel according to the specified sequence by taking the first abnormal pixel as the center.
Take the example that the gray image is represented by a two-dimensional array. Assume that the first abnormal pixel is pixel a, whose coordinates in the two-dimensional array are (x, y). The periphery of the pixel a refers to pixels in the eight neighborhood of the first outlier and in the extending direction of the eight neighborhood, i.e., pixels having coordinates of (x + n, y + n), (x-n, y-n), (x-n, y + n), (x + n, y-n), (x, y + n), (x + n, y), (x, y-n), and (x-n, y), n being an integer greater than 0.
In order to increase the speed of updating the luminance value of an abnormal pixel in the target image, the specified pixel may be determined only in the four-neighborhood region and the extending direction of the four-neighborhood region of the first abnormal pixel in the specified order centering on the first abnormal pixel. The pixels in the four-neighborhood and the extending direction of the four-neighborhood refer to pixels with coordinates of (x, y + n), (x + n, y), (x, y-n), and (x-n, y). The designated sequence may be a sequence that gradually traverses outward in the extending direction of the four-neighbor domain and the four-neighbor domain with the first abnormal pixel as the center, for example, sequentially traverses pixels with coordinates (x, y +1), (x +1, y), (x, y-1), and (x-1, y), if the designated pixel is not determined, then traverses pixels with coordinates (x, y +2), (x +2, y), (x, y-2), and (x-2, y), if the designated pixel is not determined, then traverses pixels with coordinates (x, y +3), (x +3, y), (x, y-3), and (x-3, y), and so on until the designated pixel is determined. Alternatively, the sequence of sequentially traversing each of the four neighborhoods and the extending direction thereof with the first abnormal pixel as the center, for example, sequentially traversing the pixels with the coordinates (x, y +1), (x, y +2), (x, y +3) … … until the designated pixel is determined.
The process of updating is actually a process of giving the luminance value of the specified pixel to the luminance value of the first abnormal pixel.
And step 205, adjusting the brightness uniformity of the display panel based on the updated target image.
The updated target image obtained after the above steps 201 to 204 is an image from which the interference of the foreign matter on the acquired original target image is eliminated, and the adjustment of the brightness uniformity of the display panel based on the updated target image can ensure the effect of demura.
Optionally, if the target image is a gray-scale image, and the luminance values in any one pixel channel are obtained in the form of a two-dimensional array to represent the luminance values of the entire target image as described in step 203, since the image has three pixel channels, that is, is represented by a three-dimensional matrix, in step 205, it is necessary to restore the data in the two-dimensional array to an image with three pixel channels, for example, for the gray-scale image, R ═ G ═ B, the luminance values in the pixel channel may be copied to the luminance values in the other two pixel channels to obtain a three-dimensional matrix, and then the target image is displayed by using an imshow (i) function in matlab. And I is a three-dimensional matrix corresponding to the updated target image.
In summary, in the adjusting method for a display panel according to the embodiments of the present invention, when the brightness uniformity of the display panel is adjusted, the abnormal area in the target image is determined, and then the brightness values of the sub-pixels in the abnormal area are updated, so as to achieve an effect of eliminating the abnormal area in the target image.
In addition, the method does not influence the original mura phenomenon eliminating process, can be suitable for most display panel models, and has strong universality. The algorithm for updating the brightness value of the abnormal pixel in the target image is simple, time complexity is low, space complexity is low, and too much increase in production time and occupation of terminal system resources cannot be caused. The specified brightness threshold value can be freely set, so that the use of the Demura technology under different environments and different application scenes can be met.
Fig. 5 illustrates another adjusting method for a display panel according to an embodiment of the present invention, which may be performed by an adjusting apparatus for a display panel, which may be a terminal or other apparatus with computing capability. In the method, in step 103, the adjusting of the brightness uniformity of the display panel according to the target image and the abnormal area may include: and adjusting the brightness uniformity of the area except the area corresponding to the abnormal area on the display panel. Optionally, the process may include:
In step 301, the step of obtaining the target image may refer to step 202, and is not described herein again in the embodiments of the present invention.
Each pixel region may include one pixel or a plurality of pixels, for example, the pixel region may include 16 pixels, and the 16 pixels may be a 4 × 4 pixel matrix in the target image. The luminance value of each pixel region may be an average value of luminance values of all pixels in the pixel region, or a maximum luminance value among all pixels in the pixel region, or the like. The target brightness value is determined according to the original demura technique (i.e., the demura technique performed on the display panel without considering the abnormal region in the target image), and is a brightness value for ensuring the brightness uniformity of the display panel. The target brightness value is the brightness value of each pixel when the brightness values of each pixel in the display picture in the original demura technology are consistent. The compensation luminance value is a luminance value that increases or decreases when the luminance value of each pixel region is adjusted to a target luminance value, and the compensation luminance value is a positive number or a negative number.
For example, the pixel area is a pixel matrix of 4 × 4, the luminance value of the pixel area is 20, the target luminance value is 30, and the compensation luminance value is +10, that is, the pixel area needs to be increased by 10 luminance values.
The compensation threshold may be determined in advance according to an absolute value of a difference between a luminance value of each pixel region in the target image and the target luminance value. Since the area occupied by the abnormal region in the target image is usually much smaller than the area of the target image, most of the pixel regions in the target image are not blocked by the foreign object, and therefore the compensation threshold can be determined from the difference between the luminance value of the most of the regions and the target luminance value. For example, the target image is traversed to obtain the brightness value of each pixel in the target image, the difference between the brightness value of the pixel exceeding the specified proportion threshold value in all the pixels of the target image and the target brightness is counted, and the absolute value of the difference is used as the compensation threshold value. For example, if the difference is ± 5 and the specified proportion threshold may be 90%, the absolute value of the difference of 5 is used as a compensation threshold to determine whether the pixel region is an abnormal region. Taking the compensation brightness value of +10 in step 302 as an example, since the compensation brightness threshold is greater than the compensation threshold, it may be determined that the pixel region corresponding to the compensation brightness threshold is an abnormal region.
If the absolute value of the compensation luminance value is greater than the compensation threshold and less than the target luminance value, it can be said that the luminance value of the pixel region is low, i.e. the color is dark, the luminance value of the pixel region deviates from the normal luminance (i.e. the luminance value of most of the pixel regions in the target image) is large, and the pixel region is an abnormal region.
And 304, adjusting the brightness uniformity of the area except the area corresponding to the abnormal area on the display panel according to the target image.
The brightness uniformity of the area of the display panel except the area corresponding to the abnormal area is adjusted, that is, the brightness value to be adjusted in the abnormal area is set to be 0, so that the brightness value of the abnormal area is not adjusted, and the problem that the difference between the target image after demura and the actual image is too large can be avoided.
In the demura process, a binary file (i.e., bin file) for demura is generated accordingly, and the mura phenomenon in the display panel can be eliminated by executing the binary file.
In an embodiment of the present invention, the code for performing the steps 301 to 304 may be written into the binary file, so that the adjusting method of the display panel that can be performed during the running of the binary file may be performed when the original demura is performed on the display panel in the steps 301 to 304.
In summary, in the adjusting method for the display panel according to the embodiment of the present invention, when the brightness uniformity of the display panel is adjusted, the position of the abnormal area in the target image is considered, so that the abnormal area can be ignored, and brightness of other areas except the abnormal area in the display screen of the display panel is adjusted, so that interference of foreign matters on the shot target image is avoided, and the demura effect is ensured. And the time complexity of the process of determining the abnormal pixel is low, and the occupied time is less.
Fig. 6 shows an adjusting apparatus 40 for a display panel according to an embodiment of the present invention, where the apparatus 40 includes:
a first acquisition module 401, configured to acquire a target image, where the target image is an image obtained by shooting a display screen of a display panel that displays a screen with a specified brightness;
a first determining module 402, configured to determine an abnormal region in the target image, where the abnormal region is a region in the target image corresponding to a foreign object located outside the display panel;
an adjusting module 403, configured to adjust brightness uniformity of the display panel according to the target image and the abnormal area.
In summary, the adjusting device for a display panel according to the embodiments of the present invention considers an abnormal area of a foreign object located outside the display panel in a target image when adjusting the brightness uniformity of the display panel, and can avoid the influence of the abnormal area on the brightness uniformity adjustment of the display panel when adjusting the brightness uniformity of the display panel according to the abnormal area and the target image, avoid the interference of the foreign object on the acquired target image, and ensure the effect of the demura technique.
Optionally, the first determining module 402 includes: and the determining submodule is used for determining the area where the sub-pixels with the brightness values smaller than the specified brightness threshold value in the target image are located as the abnormal area, and the specified brightness threshold value is smaller than the specified brightness.
Then, as shown in fig. 7, the adjusting module 403 includes:
an updating submodule 4031, configured to update the luminance values of the sub-pixels in the abnormal region in the target image, so that the luminance values of the sub-pixels in the abnormal region are not less than the specified luminance threshold.
And an adjusting submodule 4032, configured to perform brightness uniformity adjustment on the display panel based on the updated target image.
Optionally, the target image is a gray image, and the update sub-module 4031 is configured to:
respectively taking each pixel in the abnormal area as a first abnormal pixel, and performing a brightness value updating operation until the brightness value of each sub-pixel in the abnormal area is greater than or equal to the specified brightness threshold, wherein the brightness value updating operation comprises:
determining a designated pixel around the first abnormal pixel, wherein the brightness value of the sub-pixels in the designated pixel is greater than or equal to the designated brightness threshold value, and the brightness value of each sub-pixel in the designated pixel is the same;
and updating the brightness value of each sub-pixel in the first abnormal pixel to the brightness value of the sub-pixel in the appointed pixel.
Optionally, the update sub-module 4031 is configured to: and determining the specified pixel in the four adjacent domains of the first abnormal pixel and the extending direction of the four adjacent domains by taking the first abnormal pixel as a center according to a specified sequence.
Alternatively, as shown in fig. 8, the apparatus 40 includes:
a setting module 404, configured to set a barrier outside the display panel before acquiring the target image, where an orthographic projection of the barrier on a display screen of the display panel is located in a designated area;
a second obtaining module 405, configured to obtain a test image, where the test image is an image obtained by shooting a display screen of a display panel that displays the specified brightness screen;
a second determining module 406, configured to determine a brightness value of a corresponding area of the designated area in the test image as the designated brightness threshold.
Optionally, the first determining module 402 is configured to: determining a difference between a target luminance value and a luminance value of each pixel region in the target image as a compensated luminance value for each of the pixel regions, the pixel region comprising at least one pixel; determining a pixel region of which the compensation brightness value is greater than a compensation threshold value as the abnormal region;
an adjustment module 403, configured to: and according to the target image, adjusting the brightness uniformity of the area of the display panel except the area corresponding to the abnormal area.
In summary, the adjusting device for a display panel according to the embodiments of the present invention considers an abnormal area of a foreign object located outside the display panel in a target image when adjusting the brightness uniformity of the display panel, and can avoid the influence of the abnormal area on the brightness uniformity adjustment of the display panel when adjusting the brightness uniformity of the display panel according to the abnormal area and the target image, avoid the interference of the foreign object on the acquired target image, and ensure the effect of the demura technique.
In an exemplary embodiment, there is also provided a computer-readable storage medium, such as a memory, including instructions executable by a processor in a terminal to perform the method of adjusting a display panel in the above-described embodiments. For example, the computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.
The invention is not to be considered as limited to the particular embodiments shown and described, but is to be understood that various modifications, equivalents, improvements and the like can be made without departing from the spirit and scope of the invention.
Claims (13)
1. An adjusting method of a display panel, applied to a process of detecting a mura phenomenon of uneven brightness or a process of eliminating the mura phenomenon, the method comprising:
acquiring a target image, wherein the target image is an image obtained by shooting a display picture of a display panel displaying a specified brightness picture;
determining an abnormal area in the target image, wherein the abnormal area is an area corresponding to a foreign matter located outside the display panel in the target image;
adjusting the brightness uniformity of the display panel according to the target image and the abnormal area;
if the method is applied to the process of eliminating the mura phenomenon, the adjusting of the brightness uniformity of the display panel according to the target image and the abnormal area comprises the following steps:
and according to the target image, adjusting the brightness uniformity of the area of the display panel except the area corresponding to the abnormal area.
2. The method of claim 1, wherein the determining the abnormal region in the target image if the method is applied to the mura detection process comprises:
determining the area where the sub-pixels with the brightness values smaller than the specified brightness threshold value in the target image are located as the abnormal area, wherein the specified brightness threshold value is smaller than the specified brightness;
the adjusting of the brightness uniformity of the display panel according to the target image and the abnormal area comprises:
updating the brightness values of the sub-pixels in the abnormal region in the target image, so that the brightness values of the sub-pixels in the abnormal region are not less than the specified brightness threshold;
and adjusting the brightness uniformity of the display panel based on the updated target image.
3. The method of claim 2, wherein the target image is a grayscale image, and wherein updating the brightness values of the sub-pixels in the abnormal region such that none of the brightness values of the sub-pixels in the abnormal region are less than the specified brightness threshold comprises:
respectively taking each pixel in the abnormal area as a first abnormal pixel, and performing a brightness value updating operation until the brightness value of each sub-pixel in the abnormal area is greater than or equal to the specified brightness threshold, wherein the brightness value updating operation comprises:
determining a designated pixel around the first abnormal pixel, wherein the brightness value of the sub-pixels in the designated pixel is greater than or equal to the designated brightness threshold value, and the brightness value of each sub-pixel in the designated pixel is the same;
and updating the brightness value of each sub-pixel in the first abnormal pixel to the brightness value of the sub-pixel in the appointed pixel.
4. The method of claim 3, wherein determining the specified pixel around the first outlier pixel comprises:
and determining the specified pixel in the four adjacent domains of the first abnormal pixel and the extending direction of the four adjacent domains by taking the first abnormal pixel as a center according to a specified sequence.
5. The method of claim 2, wherein prior to said acquiring a target image, the method comprises:
arranging a shelter outside the display panel, wherein the orthographic projection of the shelter on the display picture of the display panel is positioned in a designated area;
acquiring a test image, wherein the test image is an image obtained by shooting a display picture of a display panel displaying the specified brightness picture;
and determining the brightness value of the corresponding area of the specified area in the test image as the specified brightness threshold value.
6. The method of claim 1, wherein the determining the abnormal region in the target image if the method is applied to the process of eliminating the mura phenomenon comprises:
determining a difference between a target luminance value and a luminance value of each pixel region in the target image as a compensated luminance value for each of the pixel regions, the pixel region comprising at least one pixel;
and determining the pixel area with the compensation brightness value larger than the compensation threshold value as the abnormal area.
7. An adjustment device for a display panel, the device comprising:
a first acquisition module configured to acquire a target image, the target image being an image obtained by shooting a display screen of a display panel displaying a screen with a specified brightness;
the first determining module is used for determining an abnormal area in the target image, wherein the abnormal area is an area corresponding to a foreign matter positioned outside the display panel in the target image;
the adjusting module is used for adjusting the brightness uniformity of the display panel according to the target image and the abnormal area;
the first obtaining module, the first determining module and the adjusting module execute the operations in the process of detecting the mura phenomenon of uneven brightness or in the process of eliminating the mura phenomenon;
if the first obtaining module, the first determining module and the adjusting module execute the above operations in the process of eliminating the mura phenomenon, the adjusting module is configured to: and according to the target image, adjusting the brightness uniformity of the area of the display panel except the area corresponding to the abnormal area.
8. The apparatus of claim 7, wherein if the first obtaining module, the first determining module and the adjusting module perform the above operations during the mura phenomenon detection, the first determining module comprises:
the determining submodule is used for determining an area where a sub-pixel with a brightness value smaller than a specified brightness threshold value in the target image is located as the abnormal area, and the specified brightness threshold value is smaller than the specified brightness;
the adjustment module includes:
the updating submodule is used for updating the brightness values of the sub-pixels in the abnormal region in the target image, so that the brightness values of the sub-pixels in the abnormal region are not smaller than the specified brightness threshold;
and the adjusting submodule is used for adjusting the brightness uniformity of the display panel based on the updated target image.
9. The apparatus of claim 8, wherein the target image is a grayscale image, and the update sub-module is configured to:
respectively taking each pixel in the abnormal area as a first abnormal pixel, and performing a brightness value updating operation until the brightness value of each sub-pixel in the abnormal area is greater than or equal to the specified brightness threshold, wherein the brightness value updating operation comprises:
determining a designated pixel around the first abnormal pixel, wherein the brightness value of the sub-pixels in the designated pixel is greater than or equal to the designated brightness threshold value, and the brightness value of each sub-pixel in the designated pixel is the same;
and updating the brightness value of each sub-pixel in the first abnormal pixel to the brightness value of the sub-pixel in the appointed pixel.
10. The apparatus of claim 9, wherein the update submodule is configured to:
and determining the specified pixel in the four adjacent domains of the first abnormal pixel and the extending direction of the four adjacent domains by taking the first abnormal pixel as a center according to a specified sequence.
11. The apparatus of claim 8, wherein the apparatus comprises:
the setting module is used for setting a shelter outside the display panel before a target image is acquired, and the orthographic projection of the shelter on the display picture of the display panel is positioned in a designated area;
a second acquisition module configured to acquire a test image, where the test image is an image obtained by shooting a display screen of a display panel that displays the specified luminance screen;
and the second determining module is used for determining the brightness value of the corresponding area of the specified area in the test image as the specified brightness threshold.
12. The apparatus of claim 7, wherein if the first obtaining module, the first determining module and the adjusting module perform the above operations in the process of eliminating the mura phenomenon, the first determining module is configured to:
determining a difference between a target luminance value and a luminance value of each pixel region in the target image as a compensated luminance value for each of the pixel regions, the pixel region comprising at least one pixel;
and determining the pixel area with the compensation brightness value larger than the compensation threshold value as the abnormal area.
13. A computer-readable storage medium having at least one instruction stored therein, which is loaded and executed by a processor to perform operations performed by the adjustment method of a display panel according to any one of claims 1 to 6.
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| CN111415611A (en) * | 2020-04-29 | 2020-07-14 | 京东方科技集团股份有限公司 | Brightness compensation method, brightness compensation device and display device |
| CN113112947B (en) * | 2021-04-23 | 2022-08-05 | 武汉华星光电半导体显示技术有限公司 | Display device and driving method thereof |
| US11699381B2 (en) | 2021-04-23 | 2023-07-11 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display device, driving method thereof, and electronic device |
| CN114333722B (en) * | 2021-12-24 | 2023-10-24 | 重庆惠科金渝光电科技有限公司 | Display panel debugging method and device |
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